1,720,954 research outputs found
Emergence of Acalitus phloeocoptes (Acari: Eriophyoidea) in relation to duration and type of cold exposure.
No full textThe plum bud gall mite, Acalitus phloeocoptes (Nalepa) is an important pest in Miandowab region
(West Azerbaijan province, Iran). The feeding activity of these mites create galls around buds that
lead to tree death after few years and made fruit decrease of the host plants. Early in the spring,
overwintering females migrate from the galls toward new buds where they inhabit and feed. The
controlling of this pest is depended to the investigation on its biology that must be done. Regarding
the study of the mite emergence in relation to duration and type of cold exposure, on early January
2017, 100 number of 1/2 year old plum branches in an orchard at Miandowab were marked with
ribbon tapes as field-wintered group and another 100 branches were brought to the laboratory and
stored in refrigerator with constant 3°C as laboratory-stored group. From 30 February to 24 March
2017, 12 branch sections were removed from laboratory cold-storage and 12 branches were
collected from the orchard at two weeks intervals. Selected branches had the similar diameter and
gall size. Three branches selected for each sides including north, south, east and west. A stickyband
trap was placed near the gall on each branch and branches were placed at 15°C and 13:11 (L:
D) h photoperiod. Traps were replaced on 1, 2, 3, 4, 5, 6, 10, 14, 21 and 28 days after trap
placement, and captured mites were counted using magnification 10 of Leitz LABORLUX S
microscope until no more mites were trapped. For each time by cold-storage combination, the
cumulative distribution of the proportion of mites trapped was calculated for each branch. The
number of days of median emergence for each branch in a sample was estimated by linear
interpolation to the x-axis. The mean number of days to median emergence was then calculated for
each time by cold storage combination, and a comparison between means for emergence from
laboratory-stored and field-wintered branches at each collection date was made using MSTATC
software. In general the mean time of 50% emergence of mites from field-wintered branches (4.3
days) was more than that in laboratory-stored branches (3.8 days), but this difference between the
two groups of branches was not significant. This time was almost constant in field-wintered group
(3.7–4.1 days), but there were more variation in laboratory-stored branches (3.3–5.1 days)
Plum bud gall mite survival in different sides of host tree.
No full textThe plum bud gall mite, Acalitus phloeocoptes (Nalepa) is a pest of Rosaceae plants. The feeding activity of this mite create galls around buds. Adult A. phloeocoptes overwintering females survive in the hardened galls as the infective population for the next year. After the serious damages observed in plum trees of Miandowab region, sampling was done and the pest identified as A. phloeocoptes. No economic damage was disclosed in Iran before and it seems the mites spread very fast and the problem grows every year. So this mite biology must be investigated. Regarding the study of the survived mites in different side branches, on early January 2017, 100 branches of one or two years old in four sides including north, south, east and west of each plum trees of an orchard were marked with ribbon tapes as field-wintered group and another 100 branches were brought to the laboratory and stored in constant 5°C as laboratory-stored group. From 30 February to 24 March 2017, 12 branch sections were removed from laboratory cold-storage and 12 branches were collected from the orchard at two weeks intervals. A sticky-band trap was placed near the gall on
each branch and branches were placed at 15°C and 13:11 (L: D) h photoperiod. Traps were replaced every 24 hours and captured mites were counted using magnification 10 of Leitz LABORLUX S microscope until no more mites were trapped. Finally the total mites captured in each branch counted and a comparison between means for total emerged mites from the two group branches of different sides at each collection date was made using MSTATC software. The mean number of total mites emerged from field-wintered branches (592) was more than that in laboratory-stored
branches (111). It shows that the mites better survived in the field and constant 3°C is fatal for them. The comparison between means for total emerged mites from branches of different sides showed significant difference between them. The south side branches had more emerged mites (mean = 483.1) and the north and west branches grouped as the sides with lowest emerged mites (respectively 321.1 and 261.2). It was predictable and the more worm condition of the south branches in cold regions such as Miandowab were more favourable condition for the overwintering females, because in this region there are many winter days with sub-zero minimum temperatures that will kill many of them
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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